1. 
[syn: begrimed, dingy, grimy, grubby, grungy, raunchy]
The Collaborative International Dictionary of English v.0.48:
grungy \grungy\ adj.
   thickily covered with ingrained dirt or soot; as, a grungy
   kitchen.
   Syn: begrimed, dingy, grimy, grubby.
        [WordNet 1.5]
WordNet (r) 3.0 (2006):
grungy
    adj 1: thickly covered with ingrained dirt or soot; "a miner's
           begrimed face"; "dingy linen"; "grimy hands"; "grubby
           little fingers"; "a grungy kitchen" [syn: begrimed,
           dingy, grimy, grubby, grungy, raunchy]
Moby Thesaurus II by Grady Ward, 1.0:
18 Moby Thesaurus words for "grungy":
   dingy, dirty, dusty, grimy, grubby, messy, miry, muddy, scruffy,
   slovenly, smirchy, smoky, smudgy, smutchy, smutty, snuffy, sooty,
   untidy